655557161 has 4 divisors (see below), whose sum is σ = 749208192. Its totient is φ = 561906132.

The previous prime is 655557131. The next prime is 655557167. The reversal of 655557161 is 161755556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655557161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655557167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46825505 + ... + 46825518.

It is an arithmetic number, because the mean of its divisors is an integer number (187302048).

Almost surely, 2^655557161 is an apocalyptic number.

It is an amenable number.

655557161 is a deficient number, since it is larger than the sum of its proper divisors (93651031).

655557161 is an equidigital number, since it uses as much as digits as its factorization.

655557161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93651030.

The product of its digits is 157500, while the sum is 41.

The square root of 655557161 is about 25603.8505112024. The cubic root of 655557161 is about 868.7007342558.

The spelling of 655557161 in words is "six hundred fifty-five million, five hundred fifty-seven thousand, one hundred sixty-one".